He is not here,He _____ aboard on business A.has been B.has been to C.has gone D.has gone to

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He is not here,He _____ aboard on business A.has been B.has been to C.has gone D.has gone to
He is not here,He _____ aboard on business A.has been B.has been to C.has gone D.has gone to

He is not here,He _____ aboard on business A.has been B.has been to C.has gone D.has gone to
C.has gone
aboard是副词,后面不用再加TO;
has been是曾去过,已经回来.
原句是说: 他不在这儿,他出国出差了.
显然是离开了,
has gone,表示离开,或在途中.

go aboard 或者可以说 be on aboard 上船,上飞机
由此可知,ABD都不正确

c

选C, has been aboard表示曾去过国外,但现在回来了,现在在这里。
has gone aboard 表示去了国外,现在还没回来。